Car starts and runs perfect for 15 minutes, then idles rough & engine stalls.

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Engine will not restart unless you put accelerator to the floor. Acts like it is flooded. After start it idles rough and wants to stall. After it sits for awhile it will start & run fine for approx 30 min then problem repeats. Note: Check engine light illuminates after 3 min. Pulled the code which was #12 Many thanks, Larro K.